xref: /openbmc/linux/arch/arm64/Makefile (revision 5e012745) 
1#
2# arch/arm64/Makefile
3#
4# This file is included by the global makefile so that you can add your own
5# architecture-specific flags and dependencies.
6#
7# This file is subject to the terms and conditions of the GNU General Public
8# License.  See the file "COPYING" in the main directory of this archive
9# for more details.
10#
11# Copyright (C) 1995-2001 by Russell King
12
13LDFLAGS_vmlinux	:=--no-undefined -X
14CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
15GZFLAGS		:=-9
16
17ifeq ($(CONFIG_RELOCATABLE), y)
18# Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour
19# for relative relocs, since this leads to better Image compression
20# with the relocation offsets always being zero.
21LDFLAGS_vmlinux		+= -shared -Bsymbolic -z notext -z norelro \
22			$(call ld-option, --no-apply-dynamic-relocs)
23endif
24
25ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
26  ifeq ($(call ld-option, --fix-cortex-a53-843419),)
27$(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
28  else
29LDFLAGS_vmlinux	+= --fix-cortex-a53-843419
30  endif
31endif
32
33# Check for binutils support for specific extensions
34lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
35
36ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
37  ifeq ($(lseinstr),)
38$(warning LSE atomics not supported by binutils)
39  endif
40endif
41
42ifeq ($(CONFIG_ARM64), y)
43brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
44
45  ifneq ($(brokengasinst),)
46$(warning Detected assembler with broken .inst; disassembly will be unreliable)
47  endif
48endif
49
50ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y)
51  CROSS_COMPILE_COMPAT ?= $(CONFIG_CROSS_COMPILE_COMPAT_VDSO:"%"=%)
52
53  ifeq ($(CONFIG_CC_IS_CLANG), y)
54    $(warning CROSS_COMPILE_COMPAT is clang, the compat vDSO will not be built)
55  else ifeq ($(strip $(CROSS_COMPILE_COMPAT)),)
56    $(warning CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built)
57  else ifeq ($(shell which $(CROSS_COMPILE_COMPAT)gcc 2> /dev/null),)
58    $(error $(CROSS_COMPILE_COMPAT)gcc not found, check CROSS_COMPILE_COMPAT)
59  else
60    export CROSS_COMPILE_COMPAT
61    export CONFIG_COMPAT_VDSO := y
62    compat_vdso := -DCONFIG_COMPAT_VDSO=1
63  endif
64endif
65
66KBUILD_CFLAGS	+= -mgeneral-regs-only $(lseinstr) $(brokengasinst) $(compat_vdso)
67KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables
68KBUILD_CFLAGS	+= $(call cc-disable-warning, psabi)
69KBUILD_AFLAGS	+= $(lseinstr) $(brokengasinst) $(compat_vdso)
70
71KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
72KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)
73
74ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
75prepare: stack_protector_prepare
76stack_protector_prepare: prepare0
77	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg		  \
78				-mstack-protector-guard-reg=sp_el0	  \
79				-mstack-protector-guard-offset=$(shell	  \
80			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
81					include/generated/asm-offsets.h))
82endif
83
84ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
85KBUILD_CPPFLAGS	+= -mbig-endian
86CHECKFLAGS	+= -D__AARCH64EB__
87AS		+= -EB
88# Prefer the baremetal ELF build target, but not all toolchains include
89# it so fall back to the standard linux version if needed.
90KBUILD_LDFLAGS	+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
91UTS_MACHINE	:= aarch64_be
92else
93KBUILD_CPPFLAGS	+= -mlittle-endian
94CHECKFLAGS	+= -D__AARCH64EL__
95AS		+= -EL
96# Same as above, prefer ELF but fall back to linux target if needed.
97KBUILD_LDFLAGS	+= -EL $(call ld-option, -maarch64elf, -maarch64linux)
98UTS_MACHINE	:= aarch64
99endif
100
101CHECKFLAGS	+= -D__aarch64__
102
103ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
104KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm64/kernel/module.lds
105endif
106
107# Default value
108head-y		:= arch/arm64/kernel/head.o
109
110# The byte offset of the kernel image in RAM from the start of RAM.
111ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
112TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
113		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
114		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
115else
116TEXT_OFFSET := 0x00080000
117endif
118
119ifeq ($(CONFIG_KASAN_SW_TAGS), y)
120KASAN_SHADOW_SCALE_SHIFT := 4
121else
122KASAN_SHADOW_SCALE_SHIFT := 3
123endif
124
125KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
126KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
127KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
128
129# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
130#				 - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
131# in 32-bit arithmetic
132KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
133	(0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
134	+ (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
135	- (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
136
137export	TEXT_OFFSET GZFLAGS
138
139core-y		+= arch/arm64/kernel/ arch/arm64/mm/
140core-$(CONFIG_NET) += arch/arm64/net/
141core-$(CONFIG_KVM) += arch/arm64/kvm/
142core-$(CONFIG_XEN) += arch/arm64/xen/
143core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
144libs-y		:= arch/arm64/lib/ $(libs-y)
145core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
146
147# Default target when executing plain make
148boot		:= arch/arm64/boot
149KBUILD_IMAGE	:= $(boot)/Image.gz
150
151all:	Image.gz
152
153
154Image: vmlinux
155	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
156
157Image.%: Image
158	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
159
160zinstall install:
161	$(Q)$(MAKE) $(build)=$(boot) $@
162
163PHONY += vdso_install
164vdso_install:
165	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
166
167# We use MRPROPER_FILES and CLEAN_FILES now
168archclean:
169	$(Q)$(MAKE) $(clean)=$(boot)
170
171ifeq ($(KBUILD_EXTMOD),)
172# We need to generate vdso-offsets.h before compiling certain files in kernel/.
173# In order to do that, we should use the archprepare target, but we can't since
174# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
175# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
176# Therefore we need to generate the header after prepare0 has been made, hence
177# this hack.
178prepare: vdso_prepare
179vdso_prepare: prepare0
180	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
181	$(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \
182		$(build)=arch/arm64/kernel/vdso32  \
183		include/generated/vdso32-offsets.h)
184endif
185
186define archhelp
187  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
188  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
189  echo  '  install       - Install uncompressed kernel'
190  echo  '  zinstall      - Install compressed kernel'
191  echo  '                  Install using (your) ~/bin/installkernel or'
192  echo  '                  (distribution) /sbin/installkernel or'
193  echo  '                  install to $$(INSTALL_PATH) and run lilo'
194endef
195